Tandem compound engine.



PATEN TED MAY 26, 1903.

s. M. VAUULAIN. TANDEM COMPOUND ENGINE.

APPLIOAT ION FILED MAY 3, 0

4'SHEBTS-SHEET 1.

N0 MODEL.

J U m 1 mm P W K 70 N N HQ. w J l TR R Q I L) 3 H N km 2 L \N p A 7 4 L 4 v L um Lww No. 729,456. .PATENTED MAY 26, 1903.

S. M. VAUGLAIN. TANDEM COMPOUND ENGINE.

APPLICATION I'ILEDMAY 3, 1902.

N0 MODEL. 4 4 SHBETSSHEET 2.

Tui'uonms wsrzns cgi, 'anurmiwa. WASHINGTON, o c.

PATENTED MAY 2 1903.

T No.729,456,

S. M. VAUGLAIN. TANDEM COM-POUND ENGINE.

' APPLIOATION FILED MAY 3, 1902.

4 SHEETS-SHEET 3.

N0 MODEL.

N MMMMMM No. 729,456. v PATENTED MAY 26, 1903,

I 7 1 S. M. VAUCLAIN.

TANDEMUOMPOUND ENGINE.

APPLIOATIIONFILED AY 3. 1902; I no [ODE]... 4 SHEETS-SHEET 4.

UNITED STATES Patented May 26, 1905 PATENT OFFICE.

SAMUEL M. VAUCLAIN, PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO BURNHAM, WILLIAMS d COMPANY, OF PHILADELPHIA, PENNSYLVANIA,

A FIRM.

TANDEM COMPOUND Enema.

SPECIFICATION forming part of Letters Patent No. 729,456, dated May' 26, 1903. Application filed May 3, 1902- Serial No. 105,806. (No model.)

To all whom it may concern:

Beit known that I, SAMUEL M. VAUCLAIN, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented .cer-

5 tain Improvements in Tandem Compound Engines, of which the followingis a specification;

My invention relates to certain improvements in tandem compound locomotive-errgines.

I0 The .object of my invention is to' provide means for attaching the high-pressure cylinder and valve-chestto the low-pressure cylinder and valve-chest without the use of internal bolts. This object I attain in the following manner, reference being bad to the accompanying drawings, in which-- Figure 1 is a longitudinal sectional view of sufficient of a tandem locomotive-engine to illustrate myinvention. Fig. 2 isa plan view,

and Figs. 3, 4, and 5 are views of modifications of my invention. Y

A is the high-pressure cylinder, having a valve-chest A integral therewith. B is the low-pressure cylinder, havinga valve-chest B also integral therewith, the two valve-chests A and B being in line, as indicated in Fig. 1.

D is the partition-head separating the low pressure cylinder from the high-pressure cylinder. This head snugly fits the low-pressure cylinder and is clamped thereto by theflange a of the high-pressure cylinder. Studbolts 0, screwed into the flange of the lowpressure cylinder, extend through openings in the flange a of the high-pressure cylinder and are provided with nuts 0, so that the high-pressure cylinder is rigidly clamped to the low-pressure cylinder, and the partition-head D is held firmly in place between the two cylinder-castings.

o Secured to the partition-head D is a coverplate D, forming, infact, one head of the high-pressure'cylinder. This cover-plate has external lugs through which stud-bolts 01 extend, which are provided with nuts 01. The

4 5 stud-bolts project from the head D. The nuts are not within either cylinder, but rest in a recess a, formed in the end of the casting of the high-pressure cylinder, so that it is impossible for these nuts to become loose and find their way into the cylinder. There is a ground joint between the head D and the cap the cap D.

for the piston-rod of the engine.

D at m, and there is a' ground joint between the cap and the high-pressure-cylinder cast-' ing at to. There is also a ground joint between the head D and the casting of the lowpressure cylinder at so that the joint is absolutely steam-tight.

On the head D is an annular flange C1 and extending within the space formed by this flange is an annular flange d projecting from 6o These two flanges form a cavity forthe reception of a suitable packing-box On this piston-rod are the two pistons, one mounted in the high pressure cylinder and the other mounted in the low-pressure cylinder.

The two steam chests A and B, as remarked "above, are formed integral with their respective cylinders and are secured together by stud-bolts I, which in the present instance are screwed into the flange of the low-pressure cylinder casting and extend through flanges in the high-pressure-cylinder casting. These bolts are provided with nutsi for drawing the castings together. The low-pressure valve-chest is provided with a bushing G and the high-pressure valve-chest with a bushing G. This latter bushing extends into the lowpressure valve-chest a certain distance, and a follower J is mounted on'the said bushing and has an extension which enters the box in the low-pressure casting, in which packing is placed. The follower is drawn tightly upon the packing by means of nuts 'i on the studbolts I. The passages leading from the valvechests to their respective cylinders can be made in any form desired without departing from the main feature of my invention.

In Fig. 3 I have shown a modification of the invention in which the bolts d, securing the go 'cap to the head D, are dispense'diwith, the

cap having a flange which is held between the end of the high-pressure cylinder an'd'the partition-head.

In Fig. 4 I have shown a method of fastening the two cylinders together in which a soft-metal packing-ring It is used between the cap D and the high-pressure cylinder A and a soft packing-ring is used between the two valve-chests. In this instance the 1501- I00 lower and packing are dispensed with and the two parts being drawn up onto the soft-metal packingrings by short stud-bolts. While I have shown soft-metal packing-rings, they may be dispensed with and the parts fitted together by ground joints.

In Fig. 5 I have shown the intermediate head secured to the low-pressure cylinders by the stud-bolts which secure the two cylinders together, special nuts being provided for this purpose, the plate being secured to the head by special outside bolts, and the said plate enters the high-pressure cylinder and forms its head.

I claim as my.invention 1. The combination in a tandem compound engine, of two cylinder-castings placed in line, with a head forming a partition between the high and low pressure cylinders, said head being held by andconfined between said two castings and means for holding the castings together independently of said head, substantially as described.

2. The combination in a tandem compound engine, of two cylinder-castings, the high and the low pressure cylinders being made separate and secured together, a flanged partition-head and bolts for securingsaid high and low pressure cylinder castings together independently of the partition-head, said head being confined between and held in position by portions of the two cylinders, substantially as described.

3. The combination in a tandem compound engine, of the high-pressure-cylinder casting, the loW-pressure-cylinder casting,a partitionhead between said castings, means for clamping the two castings together independently of said partition-head, and a cap for the head secured between two of said members, substantially as described.

4. The combination in a tandem compound engine of the bigh-pressure-cylinder casting, the low-prcssure-cylinder casting, each casting having a valve-chest integral therewith, bolts for securing the cylinder-castings and their valve-chests together, and a partitionplate independentof said castings and heldin position between the two cylinders independently of said securing-bolts, substantially as described.

5. The combination in atandem compound engine, of the independent high and low pressure cylinders, each having a valve-chest, said Valve-chests being in line, a bushing in each. valve-chest, one of said bushings extending across the space between the valvechests, and bolts for securing the valvechests together, substantially as described.

6. The combination in a tandem compound engine of the high and low pressure cylinders, independent valve-chests in line with each other, for said cylinders, a bushing in each valve-chest, one of said bushings extending from its valve-chest into the other valve-chest, a packing-gland for said extended bushing and bolts securing the chests together, substantially as described.

7. The combination in a tandem compound engine, of the high and low pressure cylinders, each having a valve-chest, said valvechests being in line, a bushing in one valvechestextending into the other valve-chest, a packing-gland, and bolts securing the chests together, said bolts passing through the flange of the gland and provided with nuts for tightening the gland, substantially asdescribed.

8. The combination in atandem compound engine, of the independent high and low pressure cylinders, each casting havinga valvechest, bushings in the valve-chests, a partition-head mounted between the high and low pressure cylinders, a cap mounted between the head and the high-pressure cylinder and having a cavity for the reception of packing for the piston-rod, and external bolts securing the cylinder-castings together independently of said partition-head, substantially as described.

9. The combination in atandem compound engine, of the independent high and low pressure cylinder castings, means for securing the two castings together, a partition-head clamped between the two castings, a cap mounted on the partition-head and having a cavity for the reception of packing, bolts and nuts for securing the cap to the partitionhead, the said nuts resting in the groove in the high-pressure-cylinder casting, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

SAMUEL M. VAUCLAIN.

lVitnesses:

FRED. WOOLLNEN, STEWART MCNAUGHTON, Jr. 

